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arXiv 0909.4389quant-ph
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机械谐振腔驱动振荡中的振幅噪声压缩

Amplitude Noise Squeezing in Cavity-Driven Oscillations of a Mechanical Resonator

D. A. Rodrigues, A. D. Armour

摘要:

我们分析了机械谐振器中极限环振荡的振幅和相位噪声,该机械谐振器参数耦合到驱动高于其谐振频率的光学腔。在给定的温度下,极限环振荡具有比由纯谐波驱动器激发的相同平均振幅的状态更低的振幅噪声;对于足够低的热噪声,可以产生亚泊松谐振器状态。我们还计算了发生在极限环状态的线宽变窄,并表明,而最小值是由直接相扩散,扩散由于光学弹簧效应可以占主导地位,如果腔不完全驱动边带共振。

英文摘要:

We analyze the amplitude and phase noise of limit-cycle oscillations in a mechanical resonator coupled parametrically to an optical cavity driven above its resonant frequency. At a given temperature the limit-cycle oscillations have lower amplitude noise than states of the same average amplitude excited by a pure harmonic drive; for sufficiently low thermal noise a sub-Poissonian resonator state can be produced. We also calculate the linewidth narrowing that occurs in the limit-cycle states, and show that while the minimum is set by direct phase diffusion, diffusion due to the optical spring effect can dominate if the cavity is not driven exactly at a side-band resonance.

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